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http://support.sony-europe.com/
FAQ_47_5
Are there any differences in picture quality between cRAW and RAW?
No, there is no differences. Quality is not a problem even when compressed, but for those users who like uncompressed data, we left the uncompressed raw data support.
FAQ_48_5
What is the “cRAW (compressed RAW) format”?
The cRAW format has been developed using Sony’s unique compression technology. In that format, RAW files are compressed to 60 to 70 % of their original size, while maintaining the fine, detailed information, and rich tone information of RAW images.
FAQ_49_5
What is the benefit of using cRAW (compressed RAW)?
Since the image size is smaller, writing speed and number of images that can be recorded on memory cards will be improved.